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Financial Highlights (Net Asset Value Based Total Return For A Shareholder) (Details)
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12 Months Ended | |||||||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Financial Highlights [Abstract] | ||||||||
| Total Return | 8.77% | [1] | 14.19% | [1] | 22.16% | [1] | ||
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